New coloring matters



Patented Apr. 13, 1954 UNITED STATES (OFFICE.

* j-aeiasso Q NEW COLORINQMATTERS V I Richard James Filden aln'd""Donald Graham Wilkinson, Blackley, Manchester, England, as-

signors to Imperial Chemical Industries 'Limited, a corporationof Great Britain No Drawing. Applicationl ebruary11,1952,

serialno. 271,068 b This invention relates to new: colouring mattaining axdithi'azine structure According to our invention we provide new dyestufisi which in their fr sentedhy' th e' ilo'rmula;

ters and more particularly to new dyestuffs conwhere X andY representhydrogen or halogen atoms or alkyl groups and R and R2 represent aromatic or heterocyclic radicals and n reprlee sents a number greaterthan 0. t

The new dyestuffs of our invention give fast shades on cotton and other cellulosic materials which are greener than "those obtainable from the corresponding dyestuffs of the dicxa'cirjie series; and theyhave the same highlight fastnes 's and brightness as the correspondingdioxazii ie direct dyestuffs. According to a further featureoi our inventidn ee acid form are repre- :Claims-priority, applicatio Great Britain 7 February '20, 1951 3 6 Claims. (erai we provide a process for the manufacture of new dyestuffs which comprises treatingwithsulphdnating agents compounds ofthe formula wherein X'and Y represent hydrogen or halogen atoms or alkyl groups and R1 andRz represent aromatic or heterocyclicradicals; Assulphonating agents'theremay'be used'for example; concentrated sulphuric acid"; oleum or j icegjilteringi off thet precipitated sulphate or the dyestufli and treating it with aqueous allialitojcdnyert it to the sodium salt of the dyestufi The dyestufi "may then be salted out by addin foif e ample common salt or sodium or potassium acetate.

The unsulphonated compounds are themselves new colouring matters. ;,Some of thesecan be made'by heating with sulphurwthe vappropriate NENGdiaryl-p-phenylene diamine, for example the N':N'-diphenyl=, di-Bmaphthyb, di-3-carb'azyl or di-lpyrenyl-tpephenylene diamines.

Alternatively the unsulphonated compounds can be made by heating a phenothiazone with an o-aminothiophenol in an acid medium in the presence of an oxidising agent. For example by heating 'Z-methyl-phenothiaz-B-one with the zinc salt of 1emethyl-3mercaptol-aminobenzene in acetic acid in the presence. of ferric. chloride,

2:9-dimethyl triphendithiazine is obtained.

The unsulphonated compounds wherein X and Y'are halogen atoms may be made by heating a trihalogenophenothiazone with an o-aminophenol in an acidic medium. For example when 1Y2:l-trichloro 7-anilino 9-methyl phenothiaz- 3-one is heated with 4-amino-B-mercapto-5- methyl-diphenylamine in benzoic acid there is obtained 2: 9-dianilino-4: ll-dimethyl-fi 13-dichloroetriphendithiaz ine which has the formula cm 5 01 n i 11 14 1 2 NHCuHs The invention is"illustrated but not limited by the following examplesin which the parts are by weight:

Eddmplei iodine are'heated together in a current of air to 180C. and-the mixture is maintained at this temperature for 4 hours. The reaction mixture is'thencooled, ground 111 .1 stirred with 1000 parts of -hot toluene-and filtered. 1 The residue on the filter is extracted continuously with boiling odi l ro tee neqr py e 1 9 1 9 k 3 ing, triphendithiazine separates as dark violet crystals with a brilliant metallic lustre. The crystals are filtered 01f, washed with a little benzene and dried at 100C.

The product is treated with oleum at 50 C. for 30 minutes and the reaction mixture is poured onto ice. The precipitated sulphate is filtered off, converted to the sodium salt with aqueous alkali and the dyestuff is salted out and filtered off. It dyes cotton in violet shades.

Example 2 is cooled and filtered and the residue on the filter' is washed with hot benzene and crystallised from carbonate solution.

extract is cooled and the dark blue-green micro crystalline precipitate which separates is filtered oiT, washed with a little benzene and dried at 100 C.

9 parts of the dipyrenyl derivative prepared as described above are slowly added to 100 parts of 10% oleum at room temperature. The reaction mixture is stirred at room temperature until a sample is completely soluble in dilute sodium The reaction mixture is then poured onto 200 parts of ice and the suspension so obtained is filtered. The residue on the filter is washed with brine and then stirred with 5.00 parts of hot water. Soda ash is added gradually until the dyestuff dissolves. The solution is filtered oil from a little insoluble matter nitrobenzene, when the product is isolated inthe 1 form of blue-violet bronzy needles which melt above 360 C.

The product is treated with 10% oleum at 60 C; for 4 hours and the reaction mixture is poured onto ice. The sulphate is filtered off and converted to the sodium salt with alkali, and the dyestuff is then salted out with salt and filtered off. It dyes cotton in blue shades.

Examplev 3 1 part" of N:N"-di-(3-carbazyl)-p-phenylene diamine (prepared as described below) ,'1 part of sulphur and 10-parts of nitrobenzene are stirred and boiled'undera reflux condenser for one hour. The suspension is then cooled and filtered and the residue on thefilter is washed well with benzene. The product is continuously extracted with boiling chloronaphthalene from 1;,

The product is filtered off, washed with a little benzene and dried at 100 C.

When stirred in- 10% oleum for30 minutes the product gives a sulphonic acid derivative which can be isolated by diluting in water and filtering oil the sulphate; converting this to the sodium salt and salting out the dyestufi. It dyes cotton D in greenish-blue shades.

The N:N'-di-(3-carbazyl) -p-pheny1ene diamine used in the above example is prepared as follows? A mixture of 25 parts of-3-amino-carbazole;11

parts of hydroquinone and 1 part of sulphanilic acid is slowly heated to 240 (2., and stirred at this temperature f o'r 1'4 hours. The water which is formed during the reaction is allowed to distil off. The residue is cooled and extracted successively with 500parts'of 5% caustic soda solution,

500 parts of 5% hydrochloric acid and 500 parts of ethanol and the insoluble residue is recrystallisedfrom aniline. The l\l zN'-di-(3 -carbazyl) p-phenylene diamine so obtained melts; t 365 0. Example 4 10 parts of N :N-di-(1-pyrenyl) -pphenylene diamine (prepared by heating l-amino-pyrene and hydroquinone in the presence of sulphanilic and. then extracted with .chloronaphthalenein a continuous extractor. The chloronaphthalene acid), 10 parts of sulphur and 200 parts of nitroand therdyestuff is salted out from the filtrate by adding potassium acetate. The precipitated dyestufi' is filtered off, washed with ethanol and Example 5 0.25 part of 7-methyl-phenothiaz-3-one, 0.25 part of the zinc salt of l-methyl-3-mercapto-4 aminobenzene, 7 parts of acetic acid and 0.1 part of ferric chloride are stirredtogether and boiled under a'refiux' condenser for 15 minutes. The reaction mixture is cooled and the dark violet product is filtered off, washed with ethanol, water and again with ethanol and dried. The product is recrystallised from pyridine, when 2':9'-dimethyl-triphendithiazine is obtained in the form of short needles with a high metallic lustre. The product melts above 430 C. and gives bright blue solutions in sulphuric acid. The product is sulphonated by treating it with oleum andthe sulphonated derivative thus obtained dyes cotton in red-violet shades;

Example 6' 7 parts of l:2:4-trichloro-7-anilin0-9-methylphenothiaz-3-one (which maybe prepared as described in British specification No. 265,641), 7 parts of the zinc salt of 4-amino-3-mercapto- 5-methyl diphenylamine and '70 parts of benzoic acid are intimately mixed and the mixture is heated at 240-250 C., for 15 minutes. The reaction product is cooled and stirred with boiling 2% sodium carbonate solution. The suspension is filtered and the residue on the filter is washed .well. with hot water until it is free from benz oic 3 parts of p-phenylene diamine (p by heating 2- hydroxy- 1' :2) -benz capbazole with p-phenylene diamine in the presence offal trace of iodine), 0.6 part of sulphur and 209 parts o f hitrobenzene are stirred and boiled under areiiuz; condenser with a slow stream of airbubbling into the liquor for 1 hours. The dark greenish-blue suspension is cooled and filtered-andthe-residueonrtheewfilter is e h dwithrbenzenexand. driedz liiezdithiae zine is isolated by continuously extracting the residue with boiling nitrobenzei'ie, cooling the nitrobenzene extracts and filtering when it is obtained in the form of intense dark blue needle crystals with a violet reflex. The dithiazine has the constitution Example 8 If, in the place of the 3 parts of N:N-di-[2- (l' :2) -benzcarbazyl] -p-phenylene diamine used in Example '7, there are used 3 parts of N:N'-di- [4-(3'24) benzcarbazyl]-p-phenylene diamine (prepared by heating 4-hydroxy-(3 :4) -benzcarbazole with p-phenylene diamine in the presence of a trace of iodine), a dithiazine is obtained which is greener than that of Example '7 and probably has the constitution The dithiazine may be purified by continuously extracting with boiling nitrobenzene or chlornaphthalene, cooling the nitrobenzene extracts and filtering, when it is obtained as an almost black crystalline powder. 1 part of the dithiazine &25330 isv s tirred' with-.30 partsiof:;1'00.%t sulphuric. acid untilia. test sample: i soluble.inzdi uta-iaqueous ammoniumssolutionn ThiSnIBClllilBS .between rl; and 2 hours.

The dyestuff is isolated as described in Example 7. It dyes cotton in; bright bluish-green shades of good fastness. j...-

The 4-hydroxy; (3';;1)-benzcarbazole is made from fi-methoxyrZ-teiiralone (Robinson and Weygand, Journal of the Chemical Society 1941, page 332 .-Q9 h .CQrJ iQ n b .Jea ml of the mic l sepiety.19 e P g -6&9): b onv ti eit e -9 r$n i diile p nylhy r hone, boiling thiswithaceticacid to form '4- methoxy-l :Z-dihydro- (3' :4) -benzcarbazole, dehydrogenating with chloranil to form -methoxy- (3' :4) benzcarbazole and demethylating by heating with hydrobromic acid in acetic acid. The 4-hydroxy-(3'z4') -benzcarbazol e melts at 190-193 C.

What we claim is:

1. As new dyestuffs, the sulfonic acid derivatives of the formula:

a R, Is 1 \N wherein X and Y are selected from the group consisting of hydrogen and halogen atoms, and R1 and R2 are radicals selected from the group consisting of monoand di-cyclic carbocyclic radicals, pyreno, carbazolo and carbazolobenzo radicals.

2. A process for the manufacture of new dyestuifs which comprises treating with a sulfonating agent, a compound of the formula:

i S 3.1L R2 s I N wherein X and Y are selected from the group consisting of hydrogen and halogen atoms, and R1 and R2 are radicals selected from the group consisting of monoand di-cyclic carbocyclic radicals, pyreno, carbazolo and carbazolobenzo radicals.

3. As new dyestuffs, the sulfonic acid derivatives of the formula:

wherein X and Y represent hydrogen atoms and R1 and R2 represent pyrene nuclei.

4. As new dyestuffs, the sulfonic :acid derivatives of the formula:

R] RI wherein X and Y represent hydrogen atoms and R1 and R: represent 3 :4-benzcarbazole nuclei.

26755886 5. A process for the manufacture of new dye stuffs which comprises treating with a sulfonatstufis which comprises treating with a su1fonat-' ing agent a compound of the formula: ing agent a compound of the formula: X

, N a s 5 r I R1 R2 7 S N V s \N V V r Y 10 wherein X and Y represent hydrogen atoms and R1 and R2 represent 3:4-benzca-rbazo1e nuclei.

wherein X and Y represent hydrogen atoms and R1 and R2 represent pyrene nuclei.

6. A process for the manufacture of new dye- No references cited; 

1. AS NEW DYESTUFFS, THE SULFONIC ACID DERIVATIVES OF THE FORMULA: 